From 03ddd7725ed1b39cf9251e1a420559f25dac49b3 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Wed, 2 Apr 2025 15:59:55 +0100 Subject: [PATCH] 9p: Add a migrate_folio method The migration code used to be able to migrate dirty 9p folios by writing them back using writepage. When the writepage method was removed, we neglected to add a migrate_folio method, which means that dirty 9p folios have been unmovable ever since. This reduced our success at defragmenting memory on machines which use 9p heavily. Fixes: 80105ed2fd27 (9p: Use netfslib read/write_iter) Cc: stable@vger.kernel.org Cc: David Howells Cc: v9fs@lists.linux.dev Signed-off-by: "Matthew Wilcox (Oracle)" Link: https://lore.kernel.org/r/20250402150005.2309458-2-willy@infradead.org Acked-by: Dominique Martinet Reviewed-by: David Howells Signed-off-by: Christian Brauner --- fs/9p/vfs_addr.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c index 32619d146cbc1..1286d96a29bc7 100644 --- a/fs/9p/vfs_addr.c +++ b/fs/9p/vfs_addr.c @@ -164,4 +164,5 @@ const struct address_space_operations v9fs_addr_operations = { .invalidate_folio = netfs_invalidate_folio, .direct_IO = noop_direct_IO, .writepages = netfs_writepages, + .migrate_folio = filemap_migrate_folio, }; -- 2.47.2